ci: rename job + fix version targeting

Author: justlevine

.github/workflows/php-static-analysis.yml

@@ -1,18 +1,22 @@
-name: PHP Static Analysis
+name: PHPStan Static Analysis
 
 on:
   # PHPStan testing was introduced in @todo.
   push:
     branches:
       - trunk
-      - '[6-9].[0-9]'
+      - '6.9'
+      - '[7-9].[0-9]'
     tags:
-      - '[6-9].[0-9]'
-      - '[6-9]+.[0-9].[0-9]+'
+      - '6.9'
+      - '6.9.[0-9]+'
+      - '[7-9].[0-9]'
+      - '[7-9]+.[0-9].[0-9]+'
   pull_request:
     branches:
       - trunk
-      - '[6-9].[0-9]'
+      - '6.9'
+      - '[7-9].[0-9]'
     paths:
       # This workflow only scans PHP files.
       - '**.php'